mineral
Limonite
FeO(OH)·nH2O
AI-generated identification · may be incorrectHardness of 4 to 5.5 on the Mohs scale, yellowish-brown to dark brown color, earthy to submetallic luster, and amorphous crystal structure.
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Physical properties
Hardness of 4 to 5.5 on the Mohs scale, yellowish-brown to dark brown color, earthy to submetallic luster, and amorphous crystal structure.
Formation & geological history
Formed through the weathering and oxidation of iron-rich minerals in sedimentary and hydrothermal environments.
Uses & applications
Historically used as an iron ore and a yellow-brown pigment, and commonly collected as a mineral specimen.
Geological facts
Limonite is not a single mineral, but rather a mixture of hydrated iron oxide-hydroxides. It often forms pseudomorphs after other minerals like pyrite.
Field identification & locations
Identified by its characteristic yellowish-brown streak and earthy appearance, found worldwide in gossans and weathered iron deposits.
